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i DISK WATER METER.

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UNITED STATES PATENT @FFICE.

EWIs HALLOOK NASH, OF SOUTH NORWALK, CONNECTICUT, Assieivort TO THE NATIONAL METER COMPANY, on NEW YORK, N. Y.

DISK WATER-METER.

SPECIFICATION forming part of Letters Patent No. 527,536, dated we... 16,1894. Application filed December 12,1392. Serial n5. 454,962. (No mom.)

To aZZ whom it may concern/.-

Be it known that I, LEWIs HAnLook NASH, a; citizen V of the United States, residing at South Norwalk, in the county of Fairfield and State of Connecticut, have invented certain new and usefullmprovements in Fluid-Meters, of which the following is a specification.

. My invention consists in certain novel parts and combinations of parts, the several features of which will be specificallypointed out in the claims concluding this specification. Before specifying such claimsl will describe the structure which is illustrated in the annexed drawings.

The following description read in connection with the accompanying drawings will enable any person skilled in the art to which myinvention relates to understand its nature and to practice it in the forms in which I at present prefer to embody it; but it will be understood that my invention isnot limited to the precise devices or combinations of devices shown, as various modifications may be made without departing from the spirit of my invention and without exceeding the scope of the claims concluding this specification.

Similar numerals of reference indicate the same or corresponding parts in all the figures. Referring to the drawings Figure 1 shows ahorizontal section through a meter case with a piston (which is of the nutating type) in I l place. Figs. 2 and 3 show nutating pistons removed from their cases.

The pistons shown in the accompanying drawings operate with a motion of nutation. 2, Fig. 1, is part of a case of ordinary con.- struction. t

j 3 is the inlet spud and t the outlet spud.

5 is the inlet port and 6 the passage leading to outlet port.

1 7 is the diaphragm or abutment.

The piston is made up of a ball 8, surrounded by a flange 9, in the shape of a disk or cone both forms being now well known.

- 10 is a port in the piston between the measuring chambers above and below on the inlet side. r

11 is a port in the piston between the meas uring chambersabove and below it onthe outlet side. e l The rim of the piston in certain places is as near to the sphericalside walls of the case as at other places. This feature is common to all pistons shown, Figs. 2 and 3 showing two of the many modified forms which might besuggested. l

xperience has demonstrated (as it might have been demonstrated theoretically) that the passage of water through meters of this type tends to shift the piston laterally generally toward the outlet port. When, as the result of wear, the rim of the piston touches the spherical side walls of the case, the accuracy of the meter as a measuring device is diminished, while the strain upon the piston is increased. By cutting away the rim at that point or those points which in practical operation would first come in frictional contact with thespherical walls of the case the life of the meter and its period of usefulness are increased. Q

It is obvious that this improvement may be appliedto nutating pistons of any form and to those which do not have the ports 10 and 11 or any other ports, in the region of the abutment and that it is independent, not only of these features but of various other features which may or may not be present in the meter. It is also obvious that instead of changing the form of the piston, the form of the case might be correspondingly changed for the same purpose. Furthermore it is now a well known fact that it is not necessary in structures of this class to divide measuring chambers by surfaces in actual contact. The less resistance the piston encounters andthe less difierence of pressure there be on opposite sides of the piston, the greater is the freedom of fit permissible. As ports in the piston diminish the difference of pressure on its opposite sides, they diminish to a certain extent the leakage past these cutaway portions of the piston, other conditions remaining the same, or permitmore to be cut away without sacrificing the accuracy of the device. I therefore prefer to use such ports, although asI have above remarked, my invention in its broader aspects is not limited to them.

In the foregoing specification I have inci dentally referred to a few of the modifications which may be employed in practicing my incut away so that it does not approach there r vention, but I have not endeavored to specify all the modifications which might be employed, the object of this specification being to instruct persons skilled in: the art to practice the several novel'features of my present invention in their preferred form and to enable them to understand its nature; and I I desire it to be distinctly understood that 1 mention by me of a few modifications is not in any way intended to exclude others not referred to, but which are within the spirit and; scope of my invention.

All the combinations and details illustrated and above describedare not essential to the a several features of my invention separately and broadly considered. All this will be indicated in the concluding claims, where the omission of an element or the omission of reference to the detailed features of the elements i mentioned is intended to be a formal declaration of the fact that the omitted elements or features are not essential to the inventions therein severally covered Having thus described a structureembodying in preferred forms the several features of my present: invention in combination, what I the outlet port in every position of the piston.

3. In a water meter, the combination of a case and a nutating piston provided with ports, the rim of which piston approaches nearer to the side walls of the case at some places than it does at others in every position of the piston.

In testimony whereof I have hereunto signed this specification in the presence of witnesses.

LEWIS HALLOOK NASH.

Witnesses:

J. EDGAR BULL, M. WILSON. 

